public class Test02 {
    //使用两个线程来累加count 的值
    //由于 count 是一个静态变量，所有线程都可以访问和修改它。
    private static volatile int count = 0;

    public static void main(String[] args) throws InterruptedException {
        Object locker = new Object();
        Object locker2 = new Object();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                synchronized (locker) {
                    count++;
                }
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                synchronized (locker) {
                    count++;
                }
            }
        });

        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("count = " + count);
    }
}
